OK, but you can you *derive* that formula?
Does “look up in OEIS” count as “derive”?
Tim: You, William, David, and others have figured me out. I suppose there are worse habits than repeatedly clicking the "Webcam" button on OEIS.
Find the stride of the longest skip sequence
Make a random, non-repeating vector.
Rounding off numbers to n decimals
Divisible by 3
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Test approximations of the prime counting function
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Count the ways to draw non-intersecting chords between points on a circle
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